JP7041037B2 - Hot water storage type water heater with air conditioning function - Google Patents

Description

The present invention relates to a hot water storage type water heater with an air-conditioning function that exchanges heat between a refrigerant in a refrigerating cycle and hot water flowing into a hot water storage tank in a water refrigerant heat exchanger.

Conventionally, in this type of hot water storage type water heater, as described in Patent Document 1, the heat absorbed from the indoor heat exchanger is introduced into the water refrigerant heat exchanger during the cooling operation in summer to dissipate heat to the water side. There was something that could be used for hot water supply by doing it.

Japanese Unexamined Patent Publication No. 5-5577

In the above-mentioned prior art, the heat absorption by heat exchange between the refrigerant and water in the water refrigerant heat exchanger is utilized for hot water supply in the cooling operation in summer, but the heat between the refrigerant and the water in the heating operation in winter is utilized. There was a problem that no particular consideration was given to the utilization of exchange.

In order to solve the above problems, in claim 1 of the present invention, there is a water refrigerant heat exchanger that exchanges heat between the refrigerant and water, and an indoor heat exchanger that exchanges heat between the refrigerant and the indoor air. Heat pump heat that is connected in parallel with the water refrigerant heat exchanger to the compressor and the compressor connected to the water refrigerant heat exchanger and the indoor heat exchanger to exchange heat between the refrigerant and the outside air. It has a exchanger and a hot water storage tank for storing hot water, and the water side of the water refrigerant heat exchanger and the hot water storage tank are connected in a ring shape by a hot water pipe to form a hot water circulation circuit to form the water refrigerant heat. The refrigerant side of the exchanger, the compressor, the indoor heat exchanger, and the heat pump heat exchanger are connected by a refrigerant pipe to form a refrigerant circulation circuit, and a condenser is provided with respect to the discharge side of the compressor. The inlet side of the indoor heat exchanger functioning as the heat exchanger is communicated with the outlet side of the indoor heat exchanger, and the inlet side of the water refrigerant heat exchanger functioning as an evaporator or heat exchanger is communicated with the outlet side of the indoor heat exchanger. The inlet side of the heat pump heat exchanger functioning as a condenser or radiator is communicated with the outlet side of the exchanger, and the suction side of the compressor is communicated with the outlet side of the heat pump heat exchanger to communicate the water refrigerant. In a hot water storage type water supply machine with a heating / cooling function that defrosts the heat pump heat exchanger using heat received by a refrigerant in the heat exchanger, the hot water circulation circuit is connected to the lower part of the hot water storage tank and is connected to the hot water storage tank. A low-temperature water take-out pipe for taking out hot water from the inside, a medium-hot water take-out pipe connected to an intermediate portion in the vertical direction of the hot water storage tank, and a medium-hot water take-out pipe for taking out hot water in the hot water storage tank, and a low-temperature water take-out pipe and the medium-hot water take-out pipe. At least one of the hot water provided at the confluence and introduced from the hot water storage tank via the low temperature water take-out pipe and the hot water introduced from the hot water storage tank via the medium-temperature water take-out pipe is at least one of the water of the water refrigerant heat exchanger. It is provided with a control valve leading to the side, and is a take-out temperature that determines the take-out temperature of the hot water from the hot water storage tank at the time of executing the defrosting treatment according to the heating load on the refrigerant circulation circuit side. The determination means and the valve control means for controlling the control valve according to the extraction temperature determined by the extraction temperature determination means are provided.

Further, in claim 2, the control valve mixes hot water introduced from the hot water storage tank via the low temperature water take-out pipe and hot water introduced from the hot water storage tank via the medium temperature water take-out pipe in a desired ratio. It is a possible mixing valve, and the valve control means controls the mixing ratio in the mixing valve so that the temperature of the hot water derived from the control valve becomes the take-out temperature.

Further, in claim 3, the control valve is a switching valve that can be selectively switched to the low temperature water take-out pipe side or the medium temperature water take-out pipe side, and the valve control means is from the control valve. The switching in the switching valve is controlled so that the temperature of the derived hot water becomes a temperature close to the take-out temperature.

Further, in claim 4, the valve control means controls the control valve so that the temperature of the hot water derived from the control valve is within the range of 15 ° C. or higher and 45 ° C. or lower.

Further, in claim 5, the inlet side of the indoor heat exchanger is communicated with the discharge side of the compressor, and the inlet side of the water refrigerant heat exchanger is communicated with the outlet side of the indoor heat exchanger. The defrosting treatment is performed by communicating the inlet side of the heat pump heat exchanger with the outlet side of the water refrigerant heat exchanger and the suction side of the compressor with the outlet side of the heat pump heat exchanger. The heat pump heat exchange that communicates the defrost heating mode with the inlet side of the indoor heat exchanger that functions as a condenser to the discharge side of the compressor and functions as an evaporator to the outlet side of the indoor heat exchanger. Further, it has a mode switching means capable of switching between a normal heating mode in which the inlet side of the device is communicated and the suction side of the compressor is communicated with the outlet side of the heat pump heat exchanger.

Further, in claim 6, the take-out temperature determining means depends on the rotation speed of the compressor, which represents the heating load, or the deviation between the actual room temperature of the room air and the preset target room temperature. It determines the take-out temperature.

Further, in claim 7, the hot water circulation circuit is connected to an intermediate portion in the vertical direction of the hot water storage tank, and includes a return pipe for returning hot water to the hot water storage tank, and the mode switching means is the defrost heating. The mode, the normal heating mode, and the inlet side of the indoor heat exchanger functioning as a condenser are communicated with the discharge side of the compressor, and the mode functions as a condenser with respect to the outlet side of the indoor heat exchanger. Communicates with the inlet side of the water refrigerant heat exchanger, communicates with the inlet side of the heat pump heat exchanger functioning as an evaporator to the outlet side of the water refrigerant heat exchanger, and communicates with the outlet side of the heat pump heat exchanger. It is possible to switch between a heating boiling mode that communicates with the suction side of the compressor and performs a boiling process in which hot water heated by receiving heat from the refrigerant in the water refrigerant heat exchanger is supplied to the hot water storage tank. It is configured.

Further, in claim 8, the mode switching means of the heating boiling mode is based on the outside air temperature, the evaporating refrigerant temperature of the heat pump heat exchanger functioning as an evaporator, or the actual room temperature of the indoor air. It determines the necessity of execution.

Further, in claim 9, the mode switching means further switches from the normal heating mode to the heating boiling mode according to the storage state of hot water in the hot water storage tank.

According to claim 1 of the present invention, the heat pump heat exchanger can be defrosted. That is, the inlet side of the indoor heat exchanger is communicated with the discharge side of the compressor, the inlet side of the water refrigerant heat exchanger is communicated with the outlet side, and the inlet of the heat pump heat exchanger is communicated with the outlet side. The side is communicated, and the suction side of the compressor is communicated with the outlet side. In this case, connect the water refrigerant heat exchanger and the heat pump heat exchanger in series in the order of the compressor discharge side → indoor heat exchanger → water refrigerant heat exchanger → heat pump heat exchanger → compressor suction side. A refrigeration cycle is formed. As a result, the high-temperature and high-pressure refrigerant gas from the compressor dissipates heat to the indoor air in the indoor heat exchanger (functioning as a condenser) and condenses to become a liquid refrigerant, and then a water-refrigerant heat exchanger (evaporator or heat absorber). By absorbing heat from the hot water from the hot water storage tank, it becomes a refrigerant gas again. Then, the heat of the refrigerant gas is dissipated in the heat pump heat exchanger (functioning as a condenser or radiator) to defrost the frost generated in the heat pump heat exchanger during the above-mentioned normal heating operation. Can be done. As a result, it is possible to realize a defrosting process in which the heating operation is performed without stopping the heating operation while utilizing the heat of the hot water in the hot water storage tank during the heating operation in winter.

Here, when the defrosting treatment is performed, the necessary and sufficient heat is received from the hot water storage tank side as much as possible in order to suppress the deterioration of the heating feeling due to the decrease in the indoor temperature during the treatment as much as possible. It is preferable to defrost without any shortage. For that purpose, it is important to set the hot water on the hot water circulation circuit side to the optimum temperature for giving an appropriate amount of heat.

According to the study by the inventors of the present application, the higher the take-out temperature of the hot water, the shorter the time required for the defrosting treatment, and the higher the heating capacity of the indoor heat exchanger to the indoor side during the defrosting treatment. Was found. Therefore, in response to this, according to claim 1, a low-temperature water take-out pipe is connected to the lower part of the hot water storage tank, a medium-temperature water take-out pipe is connected to the middle part in the vertical direction, and a control valve is provided at the confluence of these pipes. .. On the other hand, the take-out temperature determining means determines the take-out temperature of hot water from the hot water storage tank according to the magnitude of the heating load on the refrigerant circulation circuit side. Then, the control valve is controlled by the valve control means according to the determined take-out temperature. As a result, when the heating load is large and the heating capacity required for the indoor side is high, for example, the proportion of hot water from the medium-temperature water take-out pipe is increased (or hot water is taken out only from the medium-temperature water take-out pipe). The temperature can be made relatively high so that the refrigerant circulation circuit side can obtain a larger heat reception from the hot water circulation circuit side. On the contrary, when the heating load is small and the heating capacity required for the indoor side is low, for example, the ratio of hot water from the low-temperature water take-out pipe is increased (or hot water is taken out only from the low-temperature water take-out pipe). By making the take-out temperature relatively low, it is possible to prevent the refrigerant circulation circuit side from wastefully receiving heat from the hot water circulation circuit side.

As described above, according to claim 1, by receiving heat from the hot water storage tank side according to the amount of heat radiated from the indoor heat exchanger side, the heating operation is not stopped and the heat is surely removed without excess or deficiency. Frost can be done.

Further, according to claim 2, the low temperature water from the low temperature water take-out pipe and the medium hot water from the medium hot water take-out pipe are mixed at an appropriate mixing ratio based on the control of the valve control means to obtain hot water at the optimum temperature. It can be generated accurately and delivered to the water-refrigerant heat exchanger.

Further, according to claim 3, one of the low temperature water from the low temperature water take-out pipe and the medium temperature water from the medium hot water take-out pipe is selectively used based on the control of the valve control means, so that simple control is possible. Hot water at a suitable temperature can be generated and delivered to a water-refrigerant heat exchanger.

Further, usually, when hot water is boiled into a hot water storage tank, relatively high temperature hot water of about 60 ° C. or higher is generated in order to make the boiling efficiency relatively high. The high-temperature water is supplied from the upper part of the hot water storage tank and is stored in the upper part of the hot water storage tank, and is used for bathing, showering, hand washing, etc. at the time of hot water discharge. On the other hand, due to the decrease in the high temperature water due to the hot water discharged during user use and the accompanying water supply from the lower part of the hot water storage tank, the middle part and the lower part of the hot water storage tank have a temperature of about 30 ° C to 45 ° C, which is difficult to use for the above purposes. Medium hot water and low temperature water of about 15 ° C to 30 ° C are stored. According to claim 4, the hot water in the tank is effectively utilized by generating hot water for the water refrigerant heat exchanger using the medium hot water or low temperature water in the temperature range of 15 ° C to 45 ° C. Can be done.

Further, according to claim 5, apart from the mode for performing the defrosting treatment (defrosting and heating mode), the refrigeration cycle of the route of the compressor discharge side → the indoor heat exchanger → the heat pump heat exchanger → the compressor suction side. By providing the normal heating mode in which the air is formed, it is possible to perform a normal heating operation using heat absorption from the atmosphere as a heat source.

Further, according to claim 6, normally, the rotation speed is controlled to increase or decrease according to the magnitude of the heating load, and the deviation between the actual room temperature representing the heating load itself and the target room temperature. , The take-out temperature determining means determines the take-out temperature. By using a clear index indicating the heating load, it is possible to accurately receive heat from the hot water storage tank side according to the magnitude of the heat radiation amount on the indoor heat exchanger side.

Further, according to claim 7, the hot water circulation is caused by the mode switching means switching to the heating boiling mode in response to the consumption of the hot water in the hot water storage tank used in the defrosting treatment as described above. The circuit side can supply hot water heated by receiving heat from the refrigerant circulation circuit side with a water-refrigerant heat exchanger into the hot water storage tank. That is, in the heating boiling mode, the inlet side of the indoor heat exchanger is communicated with the discharge side of the compressor, the inlet side of the water refrigerant heat exchanger is communicated with the outlet side, and further with respect to the outlet side. The inlet side of the heat pump heat exchanger is communicated, and the suction side of the compressor is communicated with the outlet side thereof. In this case, connect the water refrigerant heat exchanger and the heat pump heat exchanger in series in the order of the compressor discharge side → indoor heat exchanger → water refrigerant heat exchanger → heat pump heat exchanger → compressor suction side. A refrigeration cycle is formed. As a result, the high-temperature and high-pressure refrigerant gas from the compressor dissipates heat to the indoor air in the indoor heat exchanger (functions as a condenser) and condenses, and also condenses in the water refrigerant heat exchanger (functions as a condenser) to store the hot water. After radiating heat to the hot water from the water, it becomes a liquid refrigerant, and then it absorbs heat from the outside air in the heat pump heat exchanger (functioning as an evaporator) to become a refrigerant gas and returns to the compressor. In this case, for example, by utilizing the surplus capacity of the heating capacity generated by the lightening of the heating load due to the normal heating operation for a certain period of time to dissipate heat to the hot water in the hot water storage tank, it is used for the subsequent defrosting treatment. Medium-temperature water can be generated and supplied to the hot water storage tank for replenishment. As a result, it is possible to prevent the heating operation from being temporarily interrupted due to defrosting, as in the case where the medium temperature water runs out without completing the defrosting of the heat pump heat exchanger and the defrosting is performed by the conventional cooling cycle. can do.

It should be noted that there is a possibility that the heat pump heat exchanger is likely to be frosted by executing the heating boiling mode. However, by using the medium warm water generated as described above in this heating boiling mode in the defrosting treatment, the time required for the defrosting treatment can be shortened (compared to the case where the defrosting treatment is not performed). can. As a result, it is possible to prevent a decrease in the feeling of heating due to an increase in room temperature when the defrosting treatment is executed.

Further, according to claim 8, it is determined whether or not the environment requires the execution of the defrosting treatment based on the outside air temperature, the evaporating refrigerant temperature, and the room temperature, and the heating is performed only when the defrosting treatment is necessary. The boiling process can be performed in the boiling mode. As a result, unnecessary boiling can be prevented and efficiency can be improved.

Further, according to claim 9, the heating boiling is performed only when the amount of the medium-temperature water is small according to the storage state of the hot water in the hot water storage tank, that is, for example, the amount of the medium-temperature water used for the defrosting treatment. The boiling process in the upper mode can be performed. As a result, unnecessary boiling can be prevented and efficiency can be improved.

Circuit configuration diagram of the entire heat pump water heater according to the first embodiment of the present invention Functional configuration diagram of the outdoor unit control unit Functional block diagram of heat exchange control unit Functional configuration diagram of the indoor unit control unit Functional block diagram of hot water storage control unit Functional configuration diagram of the heaton control unit The figure explaining the operation at the time of a normal cooling operation The figure explaining the operation at the time of cooling operation using waste heat The figure explaining the operation at the time of a normal heating operation Diagram illustrating operation during heating cycle defrost assist operation The figure which shows the correspondence relation between the compressor rotation speed and the take-out temperature in a hot water storage tank. Flow chart illustrating the processing procedure of heating cycle defrost assist operation Graph diagram showing an example of the temporal behavior of the actual room temperature, heating load, and take-out temperature The figure explaining the operation at the time of a heating boiling operation of a heat pump water heater in the 2nd Embodiment of this invention. Flow chart illustrating the processing procedure of heating cycle defrost assist operation and heating boiling operation

<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 13.

FIG. 1 shows the entire circuit configuration of the heat pump water heater 1 with a heating / cooling function (corresponding to the hot water storage type water heater 1 with a heating / cooling function) of the present embodiment.

In FIG. 1, the heat pump water heater 1 of the present embodiment includes a hot water storage unit 100 provided with a hot water storage tank 2, an outdoor unit 300 as an air conditioner outdoor unit, an indoor unit 200 as an air conditioner indoor unit, and a heat exchange unit. It has 400 and a heat pump unit 500.

The heat exchange unit 400 has a flow path 15b on the refrigerant side and a flow path 15a on the water side through which the refrigerant flows, and is a water refrigerant heat exchanger that exchanges heat between the high-temperature and high-pressure refrigerant and the hot water in the hot water storage tank 2. It includes 15 and a boiling pump 19. That is, the water-side flow path 15a of the water-refrigerant heat exchanger 15 and the hot water storage tank 2 are connected in an annular shape by a heating going pipe 5 and a heating return pipe 6 as hot water pipes, and the hot water storage unit 100 and heat exchange are performed. A heat circulation circuit 4 as a hot water circulation circuit is formed in the unit 400.

The heating going pipe 5 includes a pipe 5a, a pipe 5b (corresponding to a low-temperature water take-out pipe), a pipe 5c (corresponding to a medium-temperature water take-out pipe), and a pipe 5d (corresponding to a medium-temperature water take-out pipe). Is branched and connected from the pipe 5a via the mixing valve 10E (corresponding to the control valve). Details of the mixing valve 10E will be described later. Further, the pipe 5b is connected to the lower part of the hot water storage tank 2, and the pipe 5c is connected to the pipe 5d for taking out medium-temperature water connected to the middle portion in the height direction of the hot water storage tank 2.

The heating return pipe 6 includes a pipe 6a, a pipe 6b, a pipe 6c, a pipe 6d, and a pipe 6e, and the pipes 6b and 6c are branched and connected from the pipe 6a via a three-way valve 10C. The pipe 6b is connected to the upper part of the hot water storage tank 2, and the pipes 6d and 6e are branched and connected from the pipe 6c via a three-way valve 10D. The pipe 6d is connected to the middle portion in the height direction of the hot water storage tank 2, and the pipe 6e is connected to the lower part of the hot water storage tank 2 and connected to a water supply pipe 7 for supplying water to the hot water storage tank 2. .. A water supply bypass pipe 9 is branched from the water supply pipe 7.

The boiling pump 19 is provided in the middle of the pipe 5a, and the hot water from the heating return pipe 5 is circulated to the heating return pipe 6 through the flow path 15a on the water side, and the hot water from the hot water storage tank 2 is supplied. Circulate. The heating going pipe 5 is provided with a water inlet temperature sensor 23 for detecting the water inlet temperature T1 (inlet temperature of hot water) flowing into the water flow path 15a of the water refrigerant heat exchanger 15, and the heating is performed. The return pipe 6 is provided with a boiling temperature sensor 24 that detects the boiling temperature Tb flowing out from the water-side flow path 15a toward the hot water storage tank 2.

A pipe 8a provided in the hot water outlet pipe 8 for discharging the hot water stored in the hot water is also connected to the upper portion of the hot water storage tank 2. The hot water outlet pipe 8 includes pipes 8b and 8c in addition to the pipe 8a, and the pipe 8a and the pipe 8b are connected so as to join the pipe 8c via the mixing valve 10B. The pipe 8b is connected to the pipe 5d and guides the medium-temperature water taken out from the pipe 5d to the mixing valve 10B. The mixing valve 10B mixes the high temperature water from the pipe 8a and the medium temperature water from the pipe 8b at a desired ratio (mixing ratio) and leads to the pipe 8c. Further, the pipe 8c and the water supply bypass pipe 9 are connected so as to join the hot water outlet pipe 11 via the mixing valve 10A. The hot water supply pipe 11 is provided with a hot water supply temperature sensor 37 that detects the hot water supply temperature after mixing with the mixing valve 10A. Based on the detection result of the hot water supply temperature sensor 37, the mixing valve 10A mixes the hot water from the pipe 8c and the water from the water supply bypass pipe 9 to obtain hot water having a hot water supply set temperature.

On the side surface of the hot water storage tank 2, a plurality of hot water storage temperature sensors 12 for detecting the temperature of the hot water in the hot water storage tank 2 (hot water storage temperature) and detecting the heating status of the hot water (in other words, the hot water storage status) are provided above and below. It is provided.

On the other hand, the refrigerant circulation circuit 30 (including the refrigerant pipe 18, the refrigerant pipe 25, and the refrigerant pipe 26 described later) capable of heat exchange (details will be described later) with the hot water in the hot water storage tank 2 in the water refrigerant heat exchanger 15 It is provided over the heat exchange unit 400, the outdoor unit unit 300, and the indoor unit unit 200.

That is, in the outdoor unit unit 300, a compressor 14 for compressing the refrigerant, a four-way valve 31, and a heat pump that selectively functions as a condenser or an evaporator by heat exchange between the refrigerant and the outside air (details will be described later). The outdoor heat exchanger 17 as a heat exchanger is connected by the refrigerant pipe 18. The outdoor heat exchanger 17 is provided with an outdoor fan 67 for passing outside air through the outdoor heat exchanger 17.

Specifically, the refrigerant pipe 18 includes a pipe portion 18a on the discharge side of the compressor 14, a pipe portion 18c on the suction side of the compressor 14, and the above-mentioned during normal heating operation (FIG. 9, etc. described later). It includes a piping portion 18b connected to the piping portion 18a via a four-way valve 31. Further, the refrigerant pipe 18 is connected to the pipe portions 18d and 18e via the four-way valve 31 on the compressor 14 side of the outdoor heat exchanger 17 during normal heating operation, which will be described later, and the outdoor heat exchange. It includes a piping portion 18f connected to the anti-compressor 14 side of the vessel 17. The piping portion 18e includes a two-way valve 122, and the piping portion 18f includes an expansion valve 113 having a fully closed function as a first on-off valve.

The four-way valve 31 is a valve having four ports, and the remaining piping portion is provided for each of the two ports for the piping portions 18b and 18d (which constitute the refrigerant main path) in the refrigerant pipe 18. It switches which of the two ports for 18a and 18c communicates. The two ports for the piping portions 18a and 18c are connected to each other by a refrigerant subpath consisting of the piping portions 18a and 18c arranged in a loop, and the compressor 14 is provided on the refrigerant subpath. ing. For example, when the four-way valve 31 is switched to the state shown in FIG. 9 or the like described later (hereinafter, appropriately referred to as “switching to the heating side” or the like), the piping portion 18a on the discharge side of the compressor 14 is (hereinafter appropriately referred to as “switching to the heating side” or the like). When it is communicated with the piping portion 18b (which is the inlet side of the indoor heat exchanger 27 described later) and switched to the normal cooling operation state as shown in FIG. 7 described later (hereinafter, "switching to the cooling side" or the like as appropriate). Refers to) to communicate the piping portion 18a with the piping portions 18d and 18e on the outdoor heat exchanger 17 side.

On the other hand, the heat exchange unit 400 is provided with a refrigerant pipe 25 that serves as a flow path for the refrigerant, and the flow path 15b on the refrigerant side of the water refrigerant heat exchanger 15 is connected to the refrigerant pipe 25. ing.

Specifically, the refrigerant pipe 25 is a pipe portion 25a connecting the pipe 18d and one side of the water refrigerant heat exchanger 15 (specifically, the flow path 15b on the refrigerant side), and the water refrigerant heat exchange. It includes a pipe portion 25b that connects the other side of the vessel 15 (specifically, the flow path 15b on the refrigerant side) opposite to the pipe portion 25a and the pipe 18f. The piping portion 25a includes a two-way valve 121 as a second on-off valve capable of opening and closing the four-way valve 31 and the one side of the water refrigerant heat exchanger 15, and the piping portion 25b has a fully closed function. The expansion valve 111 is provided.

A bypass circuit 600 is provided so as to straddle the heat exchange unit 400 and the outdoor unit unit 300. The bypass circuit 600 includes the branch portion P1 between the flow path 15b on the refrigerant side of the water refrigerant heat exchanger 15 and the two-way valve 121 in the piping portion 25a, and the piping portion 18f. A branch portion P2 between the expansion valve 113 and the outdoor heat exchanger 17 is connected. Further, an expansion valve 610 with a fully open function is provided in the middle of the bypass circuit 600.

On the other hand, the indoor unit 200 is provided with a refrigerant pipe 26 that serves as a flow path for the refrigerant, and selectively functions as a condenser or an evaporator by heat exchange between the refrigerant and the indoor air (details will be described later). ) Is connected to the refrigerant pipe 26. The indoor heat exchanger 27 is provided with an indoor fan 77 for passing indoor air through the indoor heat exchanger 27.

Specifically, the refrigerant pipe 26 is provided in communication with the pipe 18b and is connected to the inlet side (see FIG. 9 or the like described later) of the indoor heat exchanger 27 during normal heating operation or the like. 26a and a piping portion 26b for connecting the outlet side (see FIG. 9 and the like described later) of the indoor heat exchanger 27 to the pipe 18f during normal heating operation and the like are included.

Further, the heat pump unit 500 has a flow path 115b on the refrigerant side for circulating the refrigerant and a flow path 115a on the water side, and can exchange heat between the high-temperature and high-pressure refrigerant and the hot water in the hot water storage tank 2. It is equipped with a exchanger 115 and a boiling pump 119. That is, the pipe 105a branched from the three-way valve 10F provided in the pipe 5a of the heating going pipe 5 is one side (lower side in the drawing) of the water side flow path 115a of the water refrigerant heat exchanger 115. Along with being connected, a pipe 106a branched from the pipe 6a of the heating return pipe 6 is connected to the other side (upper side in the drawing) of the water flow path 115a, and the pipes 106a and 105a are used to connect the pipe 106a. A heating circulation circuit 104 as a hot water circulation circuit is formed in the heat pump unit 500. The boiling pump 119 is provided in the middle of the pipe 105a, and the hot water from the heating return pipe 5 is circulated to the heating return pipe 6 through the flow path 115a on the water side, and the hot water from the hot water storage tank 2 is supplied. Can be circulated.

Further, the heat pump unit 500 is provided with a refrigerant circulation circuit 130 that can exchange heat with the hot water in the hot water storage tank 2 in the water-refrigerant heat exchanger 115. That is, in the refrigerant circulation circuit 130, the compressor 114 that compresses the refrigerant, the outdoor heat exchanger 117 that selectively functions as a condenser or an evaporator by heat exchange between the refrigerant and the outside air, and the expansion valve 123 are provided. , Connected by the refrigerant pipe 118. The outdoor heat exchanger 117 is provided with an outdoor fan 167 for passing outside air through the outdoor heat exchanger 117.

Here, for example, R32 refrigerant is used as the refrigerant in the refrigerant circulation circuits 30 and 130 to form a heat pump cycle. The refrigerant may be an HFC refrigerant, an HFO refrigerant, or a carbon dioxide refrigerant. Then, in the refrigerant pipe 18, the pipe portion 18a is provided with a discharge temperature sensor 20 for detecting the refrigerant discharge temperature Tout discharged from the compressor 14, and the pipe portion 18c is sucked into the compressor 14. A suction temperature sensor 32 for detecting the refrigerant suction temperature Tin of the refrigerant is provided. The outdoor heat exchanger 17 is provided with an outside air temperature sensor 22 for detecting the outside air temperature Tair and a refrigerant temperature sensor 35 for detecting the evaporated refrigerant temperature in the outdoor heat exchanger 17. The detection results of these sensors 20, 32, 22, and 35 are input to the outdoor unit control unit 410 provided in the outdoor unit unit 300, and further, the hot water storage control unit 420 and the indoor unit unit provided in the hot water storage unit 100 as appropriate. It is also input to the indoor unit control unit 430 provided in the 200, the heat exchange control unit 440 provided in the heat exchange unit 400, and the heat pump control unit 450 provided in the heat pump unit 500 (received via the outdoor unit control unit 410). Alternatively, it may be received directly from the sensors 20, 32, 22, 35).

Further, in the refrigerant pipe 25 of the heat exchange unit 400, the pipe portion 25b is provided with an outflow temperature sensor 21 for detecting the refrigerant outflow temperature T2 flowing out from the flow path 15b on the refrigerant side and heading toward the expansion valve 111. Has been done. The water-refrigerant heat exchanger 15 is provided with a condensation temperature sensor 33 that detects the refrigerant condensation temperature when the refrigerant condenses in the flow path 15b on the refrigerant side. The detection results of these sensors 21 and 33 are input to the heat exchange control unit 440 provided in the heat exchange unit 400, and further, as appropriate, the outdoor unit control unit 410, the indoor unit control unit 430, and the hot water storage control unit. It is also input to the 420 and the heat pump control unit 450 (may be received via the heat exchange control unit 440 or may be received directly from the sensors 21 and 33).

Further, in the refrigerant pipe 26 of the indoor unit 200, the indoor heat exchanger 27 is provided with an indoor temperature sensor 34 that detects the indoor temperature Tr (corresponding to the actual room temperature of the indoor air) in the air-conditioned space. .. The detection result of the sensor 34 is input to the indoor unit control unit 430 provided in the indoor unit unit 200, and further, the outdoor unit control unit 410, the hot water storage control unit 420, the heat exchange control unit 440, and the heat pump are appropriately used. It is also input to the control unit 450 (may be received via the indoor unit control unit 430 or may be received directly from the sensor 34).

Then, the hot water storage control unit 420 of the hot water storage unit 100, the heat exchange control unit 440 of the heat exchange unit 400, the outdoor unit control unit 410 of the outdoor unit 300, and the indoor unit control unit of the indoor unit 200. The 430 and the heat pump control unit 450 of the heat pump unit 500 are communicably connected to each other, and based on the detection results of the respective sensors, the hot water storage unit 100 and the heat exchange unit 400 cooperate with each other. Controls the operation of each device / actuator in the outdoor unit 300, the indoor unit 200, and the heat pump unit 500.

At this time, the indoor unit 200 can be operated by an appropriate operation unit 60 (hereinafter, simply referred to as “remote controller 60”) such as a remote controller. That is, the remote control 60 is connected to, for example, the indoor unit control unit 430 so as to be able to transmit and receive information, and the user can manually operate the remote control 60 to instruct which operation to perform, that is, , Cooling operation of atmospheric exhaust heat (hereinafter appropriately referred to as "normal cooling operation", etc.), Cooling operation of hot water supply using exhaust heat (hereinafter appropriately referred to as "hot water supply operation using exhaust heat", etc.), Heating operation of atmospheric heat absorption (hereinafter appropriately referred to as appropriate) , "Normal heating operation", etc.), Heating operation in which defrosting by hot water storage heat utilization / atmospheric heat absorption is performed in the heating cycle (hereinafter, appropriately referred to as "heating cycle defrosting assist operation", etc.), The water refrigerant heat exchanger 15 It is possible to instruct whether to perform a boiling operation (hereinafter, appropriately referred to as "heating boiling operation" or the like) for supplying hot water heated by receiving heat from the refrigerant in the hot water storage tank 2 to the hot water storage tank 2. The contents of instructions from the remote controller 60 are input to the indoor unit control unit 430 provided in the indoor unit unit 200, and further, the outdoor unit control unit 410, the heat exchange control unit 440, and the hot water storage control unit 420 are appropriately used. It is also input to the heat pump control unit 450 (may be received via the indoor unit control unit 430, or may be received directly from the remote controller 60).

<Outdoor unit control unit>
Next, the outdoor unit control unit 410 provided in the outdoor unit unit 300 will be described. Although detailed illustration is omitted, the outdoor unit control unit 410 includes a storage unit for storing various data and programs, and a control unit for performing arithmetic and control processing. The functional configuration of the outdoor unit control unit 410 will be described with reference to FIG.

As shown in FIG. 2, the outdoor unit control unit 410 includes a four-way valve control unit 410A, a compressor control unit 410B, an expansion valve control unit 410C, an outdoor fan control unit 410D, and a two-way valve control unit 410E. , Is functionally equipped.

In the four-way valve control unit 410A, an operation instruction as to which operation is to be performed, which is instructed by the remote controller 60, and the hot water storage temperature detected by the hot water storage temperature sensor 12 are input.

The four-way valve control unit 410A actually operates the heat pump water supply machine 1 in what operation mode (the above-mentioned normal cooling operation) according to the operation instruction and the heating state (hot water storage state) of the hot water corresponding to the hot water storage temperature. , Exhaust heat utilization hot water supply operation, normal heating operation, heating cycle defrosting assist operation), and the corresponding operation information is provided to the compressor control unit 410B, expansion valve control unit 410C, and outdoor fan control unit 410D. , Two-way valve control unit 410E, hot water storage control unit 420, indoor unit control unit 430, heat exchange control unit 440, and heat pump control unit 450. Further, the four-way valve control unit 410A outputs an on-off signal corresponding to the determined operation mode to the four-way valve 31 and switches the four-way valve 31 (detailed control contents will be described later).

In the compressor control unit 410B, the outside air temperature Tair detected by the outside air temperature sensor 22, the room temperature Tr detected by the room temperature sensor 34, and the air conditioner set temperature Tcon set by the remote control 60 ( (Equivalent to the target room temperature) is input (in addition to the case of direct input, the above-mentioned indirect input is also included. The same shall apply hereinafter). The compressor control unit 410B rotates the compressor 14 based on at least one of the input temperature and settings according to the operation information input from the four-way valve control unit 410A as described above. Control the number (output the rotation speed control value to the compressor 14). The rotation speed control value of the compressor 14 at this time is also output to the hot water storage control unit 420 described later.

The expansion valve control unit 410C has the refrigerant discharge temperature Tout detected by the discharge temperature sensor 20, the refrigerant outflow temperature T2 detected by the outflow temperature sensor 21, and the refrigerant outflow temperature T2 detected by the suction temperature sensor 32. The refrigerant suction temperature Tin is input. The expansion valve control unit 410C controls the opening degree of the expansion valve 113 based on at least one of the input temperatures according to the operation information from the four-way valve control unit 410A (detailed control). The contents will be described later).

The two-way valve control unit 410E controls the opening and closing of the two-way valve 122 according to the operation information from the four-way valve control unit 410A (detailed control contents will be described later).

The outside air temperature Tair detected by the outside air temperature sensor 22 is input to the outdoor fan control unit 410D. The outdoor fan control unit 410D controls the rotation speed of the outdoor fan 67 based on the outside air temperature Tire according to the operation information from the four-way valve control unit 410A (detailed control contents will be described later).

The operation mode may be determined by the hot water storage control unit 420, the indoor unit control unit 430, the heat exchange control unit 440, or the heat pump control unit 450. In this case, the operation information corresponding to the determined operation mode is input to the outdoor unit control unit 410 from the hot water storage control unit 420, the indoor unit control unit 430, the heat exchange control unit 440, and the heat pump control unit 450, and the operation information thereof is input to the outdoor unit control unit 410. The four-way valve control unit 410A, the compressor control unit 410B, the expansion valve control unit 410C, the outdoor fan control unit 410D, and the two-way valve control unit 410E perform various controls according to the input operation information.

<Heat exchange control unit>
Next, the heat exchange control unit 440 provided in the heat exchange unit 400 will be described. Like the outdoor unit control unit 410, the heat exchange control unit 440 includes a storage unit and a control unit, and its functional configuration will be described with reference to FIG.

As shown in FIG. 3, the heat exchange control unit 440 functionally includes a pump control unit 440A, an expansion valve control unit 440B, and a two-way valve control unit 440C.

The operation information from the outdoor unit control unit 410 and the boiling temperature Tb detected by the boiling temperature sensor 24 are input to the pump control unit 440A. The pump control unit 440A controls the rotation speed of the boiling pump 19 based on the input boiling temperature Tb according to the operating information input from the outdoor unit control unit 410 as described above.

The expansion valve control unit 440B has the operation information from the outdoor unit control unit 410, the outside air temperature Tire detected by the outside air temperature sensor 22, and the compressor control unit 410B of the outdoor unit control unit 410. The input rotation speed of the compressor 14 (control value; however, the actual rotation speed of the compressor 14 detected by a known method may be input) and the refrigerant detected by the outflow temperature sensor 21. The outflow temperature T2, the refrigerant suction temperature Tin detected by the suction temperature sensor 32, and the refrigerant discharge temperature Tout detected by the discharge temperature sensor 20 are input. The expansion valve control unit 440B opens / closes or opens / closes the expansion valves 1110 and 610 based on at least one of the input temperatures and rotation speeds according to the operation information from the outdoor unit control unit 410. (Detailed control details will be described later).

The operation information from the outdoor unit control unit 410 is input to the two-way valve control unit 440C. The two-way valve control unit 440C controls the opening / closing operation of the two-way valve 121 based on the operation information (detailed control contents will be described later).

In the same manner as described above, the operation mode may be determined in the heat exchange control unit 440 (for example, the two-way valve control unit 440C), the indoor unit control unit 430, the hot water storage control unit 420, or the heaton control unit 450. In this case, the pump control unit 440A and the expansion valve control unit are in accordance with the operation information corresponding to the operation mode determined by the two-way valve control unit 440C, the indoor unit control unit 430, the hot water storage control unit 420, and the heat pump control unit 450. The 440B performs various controls.

<Indoor unit control unit>
Next, the indoor unit control unit 430 provided in the indoor unit 200 will be described. Like the outdoor unit control unit 410 and the heat exchange control unit 440, the indoor unit control unit 430 includes a storage unit and a control unit, and the functional configuration thereof will be described with reference to FIG.

As shown in FIG. 4, the indoor unit control unit 430 functionally includes an indoor fan control unit 430A. The indoor fan control unit 430A contains the operation information from the outdoor unit control unit 410, the indoor temperature Tr detected by the indoor temperature sensor 34, and the air conditioner set temperature Tcon set by the remote controller 60. Entered. The indoor fan control unit 430A controls the rotation speed of the indoor fan 77 based on the indoor temperature Tr and the air conditioner set temperature Tcon according to the operation information from the outdoor unit control unit 410.

In the same manner as described above, the operation mode may be determined in the indoor unit control unit 430, the heat exchange control unit 440, the hot water storage control unit 420, or the heat pump control unit 450. In this case, the indoor fan control unit 430A performs the control according to the operation information corresponding to the operation mode determined by the indoor unit control unit 430, the heat exchange control unit 440, the hot water storage control unit 420, and the heat pump control unit 450. ..

<Hot water storage control unit>
Next, the hot water storage control unit 420 provided in the hot water storage unit 100 will be described. Like the outdoor unit control unit 410, the heat exchange control unit 440, and the indoor unit control unit 430, the hot water storage control unit 420 includes a storage unit and a control unit, and the functional configuration thereof will be described with reference to FIG.

As shown in FIG. 5, the hot water storage control unit 420 functionally includes a take-out control unit 420A (corresponding to a take-out temperature determining means and a valve control means), a return control unit 420B, and a temperature control unit 420C. There is.

The take-out control unit 420A has the water inlet temperature T1 (hot water inlet temperature) from the water inlet temperature sensor 23 of the water-refrigerant heat exchanger 15 and the rotation speed (control value) of the compressor 14 from the outdoor unit control unit 410. The operation information from the outdoor unit control unit 410 and the hot water storage temperature detected by the hot water storage temperature sensor 12 are input. The take-out control unit 420A appropriately controls the opening degree of the mixing valve 10E according to the operation information from the outdoor unit control unit 410 and the heating status (hot water storage status) of the hot water corresponding to the hot water storage temperature. .. The mixing valve 10E is configured so that hot water introduced from the hot water storage tank 2 via the pipe 5b and hot water introduced from the hot water storage tank 2 via the pipes 5d and 5c can be mixed at a desired ratio.

The operation information from the outdoor unit control unit 410 and the hot water storage temperature detected by the hot water storage temperature sensor 12 are input to the return control unit 420B. The return control unit 420B appropriately controls the opening degree of the three-way valves 10C and 10D according to the operation information from the outdoor unit control unit 410 and the heating status (hot water storage status) of the hot water corresponding to the hot water storage temperature. do. As a result, the hot water after heat exchange in the water-refrigerant heat exchanger 15 is returned to the lower part of the hot water storage tank 2 via the pipes 6c and 6e, or is intermediate between the hot water storage tanks 2 via the pipes 6c and 6d. Whether to return to the unit or to the upper part of the hot water storage tank 2 via the pipe 6b is controlled.

The operation information from the outdoor unit control unit 410, the hot water storage temperature detected by the hot water storage temperature sensor 12, and the hot water supply temperature detected by the hot water supply temperature sensor 37 are input to the temperature control unit 420C. .. The temperature control unit 420C sets the hot water supply temperature from the hot water supply temperature sensor 37 according to the operation information from the outdoor unit control unit 410 and the heating status (hot water storage status) of the hot water corresponding to the hot water storage temperature. The opening degrees of the mixing valves 10A and 10B are appropriately controlled so as to reach the hot water supply set temperature.

In the same manner as described above, the operation mode may be determined in the hot water storage control unit 420, the heat exchange control unit 440, the indoor unit control unit 430, or the heat pump control unit 450. In this case, the take-out control unit 420A, the return control unit 420B, and the temperature control unit 420C respond to the operation information corresponding to the operation mode determined by the hot water storage control unit 420, the heat exchange control unit 440, and the indoor unit control unit 430. The control is performed.

<Heapon control unit>
Next, the heat pump control unit 450 provided in the heat pump unit 500 will be described. Like the outdoor unit control unit 410, heat exchange control unit 440, indoor unit control unit 430, and hot water storage control unit 420, the heat pump control unit 450 includes a storage unit and a control unit, and its functional configuration is shown in FIG. Will be explained by.

As shown in FIG. 6, the heat pump control unit 450 functionally includes a pump control unit 450A, a compressor control unit 450B, an expansion valve control unit 450C, and an outdoor fan control unit 450D.

The pump control unit 450A has the operation information from the outdoor control unit 410 and an outlet from a temperature sensor (not shown) provided on the outlet side of the water-side flow path 115a of the water-refrigerant heat exchanger 115. The temperature is entered. The pump control unit 450A controls the rotation speed of the boiling pump 119 based on at least one of the input temperature and setting according to the operation information input as described above.

The operation information from the outdoor unit control unit 410 and the outside air temperature Tair detected by the outside air temperature sensor 22 are input to the compressor control unit 450B. The compressor control unit 450B controls the rotation speed of the compressor 114 based on at least one of the input temperature and setting according to the operation information input as described above.

The expansion valve control unit 450C contains the operation information from the outdoor unit control unit 410 and the refrigerant discharge temperature detected by the discharge temperature sensor 20 (not shown) provided on the discharge side of the compressor 114. Is entered. The expansion valve control unit 450C controls the opening degree of the expansion valve 123 based on at least one of the input temperatures according to the operation information.

The operation information from the outdoor unit control unit 410 and the outside air temperature Tire detected by the outside air temperature sensor 22 are input to the outdoor fan control unit 450D. The outdoor fan control unit 450D controls the rotation speed of the outdoor fan 167 based on the outside air temperature Tair according to the operation information.

In the same manner as described above, the operation mode may be determined in the heat pump control unit 450, the hot water storage control unit 420, the indoor unit control unit 430, or the heat exchange control unit 440. In this case, the compressor control unit 450B and the expansion valve control according to the operation information corresponding to the operation mode determined by the heat pump control unit 450, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440. The unit 450C and the outdoor fan control unit 450D perform the above control.

The heaton control unit 450 is controlled by the compressor control unit 450B, the expansion valve control unit 450C, and the outdoor fan control unit 450D even when the heat exchange in the water refrigerant heat exchanger 15 is not performed (or). In addition to the execution of the heat exchange in the water-refrigerant heat exchanger 15, a boiling operation for heating and supplying hot water in the hot water storage tank 2 can be executed.

Here, as described above, in the heat pump water heater 1 of the present embodiment, each type of operation such as normal cooling operation, hot water supply operation using waste heat, normal heating operation, heating cycle defrosting assist operation, and heating boiling operation is performed. It can be executed selectively. Hereinafter, the details of each operation will be described in sequence.

<Normal cooling operation>
First, the normal cooling operation will be described with reference to FIG. 7. During the normal cooling operation shown in FIG. 7, the four-way valve control unit 410A allows the four-way valve 31 to communicate the piping unit 18a with the piping unit 18d and the piping unit 18c with the piping unit 18b. It can be switched to the position (cooling side described above). Further, the two-way valve control units 410E and 440C switch the two-way valve 122 to the open state and the two-way valve 121 to the closed state. Further, the expansion valve control units 410C and 440B control the expansion valve 113 to an appropriate opening degree, the expansion valve 111 to the fully closed state, and the expansion valve 610 to the fully closed state.

As a result, the piping section 18a on the discharge side of the compressor 14 → the piping section 18d → the piping section 18e (two-way valve 122) → the outdoor heat exchanger 17 → the piping section 18f (expansion valve 113) → the piping section 26b → the indoor heat exchange. The refrigerant path of the vessel 27 → the piping portion 26a → the piping portion 18b → the piping portion 18c on the suction side of the compressor 14 is formed.

As a result, the gas-state refrigerant sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, and then the outdoor heat exchanger functions as a condenser together with the rotational drive of the outdoor fan 67. In 17, heat is exchanged with the outside air to release heat and change into a high-pressure liquid. The liquid refrigerant is appropriately depressurized by the expansion valve 113 to become a low-temperature, low-pressure liquid that easily evaporates, and in the indoor heat exchanger 27 that functions as an evaporator together with the rotational drive of the indoor fan 77. It absorbs heat from the indoor air, evaporates and changes to gas, which cools the air-conditioned space and returns to the compressor 14 as low-temperature, low-pressure gas.

<Hot water supply operation using waste heat>
Next, the hot water supply operation using waste heat will be described with reference to FIG. During the waste heat utilization hot water supply operation (corresponding to the exhaust heat utilization cooling mode) shown in FIG. 8, the four-way valve 31 is switched to the cooling side by the four-way valve control unit 410A as in the normal cooling operation. Be done. Further, the two-way valve control units 410E and 440C switch the two-way valve 122 to the closed state and the two-way valve 121 to the open state. Further, the expansion valve control units 410C and 440B control the expansion valve 113 to a fully closed state and the expansion valve 111 to an appropriate opening degree.

As a result, the piping section 18a on the discharge side of the compressor 14 → the piping section 18d → the piping section 25a (two-way valve 121) → the water refrigerant heat exchanger 15 → the piping section 25b (expansion valve 111) → the piping section 26b → the room heat. The refrigerant path of the exchanger 27 → the piping portion 26a → the piping portion 18b → the piping portion 18c on the suction side of the compressor 14 is formed.

As a result, the refrigerant in the gas state sucked at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, and then on the refrigerant side of the water refrigerant heat exchanger 15 that functions as a condenser. It changes to a high-pressure liquid while releasing heat in the flow path 15b. The refrigerant that has become liquid in this way is appropriately depressurized by the expansion valve 111 to become a low-temperature, low-pressure liquid that easily evaporates, and in the indoor heat exchanger 27 that functions as an evaporator together with the rotational drive of the indoor fan 77. It absorbs heat from the indoor air, evaporates and changes to gas, which cools the air-conditioned space and returns to the compressor 14 as low-temperature, low-pressure gas.

At this time, the boiling pump 19 rotates under the control of the pump control unit 440A, so that the low temperature water (unheated water) taken out from the pipe 5b connected to the lower part of the hot water storage tank 2 exchanges heat with the water refrigerant. After being heated by receiving heat from the condensed refrigerant in the water-side flow path 15a of the vessel 15, it is returned to the hot water storage tank 2 from the pipe 6b connected to the upper part of the hot water storage tank 2 to enter the hot water storage tank 2. High-temperature water (heated water) is sequentially stored in a laminated manner. As a result of the above, the cooling waste heat in the summer can be utilized for heating (hot water supply) the hot water to the hot water storage tank 2.

<Normal heating operation>
Next, the normal heating operation will be described with reference to FIG. During the normal heating operation (corresponding to the normal heating mode) shown in FIG. 9, the four-way valve 31 uses the four-way valve control unit 410A to communicate the piping unit 18a with the piping unit 18b and the piping unit 18c. Can be switched to a position (the heating side described above) for communicating with the piping portion 18d. Further, the two-way valve control units 410E and 440C switch the two-way valve 122 to the open state and the two-way valve 121 to the closed state. Further, the expansion valve control units 410C and 440B control the expansion valve 113 to an appropriate opening degree, the expansion valve 111 to the fully closed state, and the expansion valve 610 to the fully closed state.

As a result, the piping section 18a on the discharge side of the compressor 14 → the piping section 18b → the piping section 26a → the indoor heat exchanger 27 → the piping section 26b → the piping section 18f (expansion valve 113) → the outdoor heat exchanger 17 → the piping section 18e (Two-way valve 122) → Piping section 18d → A refrigerant path for the piping section 18c on the suction side of the compressor 14 is formed.

As a result, the gas-state refrigerant sucked in at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, and then heat exchange with the indoor air in the indoor heat exchanger 27 functioning as a condenser. It changes to a high-pressure liquid while releasing heat and heating the air-conditioned space. The refrigerant that has become liquid in this way is decompressed by the expansion valve 113 to become a low-temperature, low-pressure liquid that easily evaporates, and heat exchanges with the outside air in the outdoor heat exchanger 17 that functions as an evaporator to evaporate. It absorbs heat by changing to gas, and returns to the compressor 14 again as low-temperature, low-pressure gas.

<Heating cycle defrost assist operation>
Next, the heating cycle defrosting assist operation will be described with reference to FIG. During the heating cycle defrosting assist operation (corresponding to the defrosting heating mode) shown in FIG. 10, the four-way valve 31 is placed on the heating side by the four-way valve control unit 410A as in the normal heating operation. Can be switched. Further, the two-way valve control units 410E and 440C switch the two-way valve 122 to the open state and the two-way valve 121 to the closed state in the same manner as described above. Further, the expansion valve control units 410C and 440B control the expansion valve 113 to a fully closed state, the expansion valve 111 to a fully open state, and the expansion valve 610 to a fully open state.

As a result, the piping section 18a on the discharge side of the compressor 14 → the piping section 18b → the piping section 26a → the indoor heat exchanger 27 → the piping section 26b → the piping section 25b (expansion valve 111) → the water refrigerant heat exchanger 15 → the bypass circuit. 600 (expansion valve 610) → outdoor heat exchanger 17 → piping unit 18e (two-way valve 122) → piping unit 18d → a refrigerant path of the piping unit 18c on the suction side of the compressor 14 is formed.

As a result, the gas-state refrigerant sucked in at low temperature and low pressure is compressed by the compressor 14 to become high temperature and high pressure gas, and then heat exchange with the indoor air in the indoor heat exchanger 27 functioning as a condenser. After heating the space to be air-conditioned by releasing heat and changing to a high-pressure liquid, the gas evaporates in the flow path 15b on the refrigerant side of the water refrigerant heat exchanger 15 that functions as an evaporator or a heat absorber. By changing to or absorbing heat, heat is absorbed from the hot water from the hot water storage tank 2 flowing through the flow path 15a on the water side. After that, by further releasing heat in the outdoor heat exchanger 17 that functions as a condenser, for example, frost formation generated in the outdoor heat exchanger 17 during the normal heating operation is melted to assist defrosting. The refrigerant whose temperature has dropped in this way returns to the compressor 14 again.

That is, in this case, the water-refrigerant heat exchanger 15 as an evaporator and the outdoor heat exchanger 17 as a condenser are connected in series in this order. At this time, the boiling pump 19 rotates under the control of the pump control unit 440A, so that the hot water taken out from the hot water storage tank 2 flows in the water-side flow path 15a of the water refrigerant heat exchanger 15 as described above. After radiating heat to evaporate or absorb heat of the refrigerant, the refrigerant is returned to the hot water storage tank 2 from the pipe 6e connected to the lower part of the hot water storage tank 2.

As described in the operation mode, in the present embodiment, the four-way valve 31, the two-way valves 122, 121, the expansion valves 113, 111, the expansion valve 610, and the bypass circuit 600 are used. The outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 that control these functions as the mode switching means according to each claim.

<Outline of the method of the embodiment>
As described above, in the present embodiment, the heat of the refrigerant gas is dissipated in the outdoor heat exchanger 17, and the frost generated in the outdoor heat exchanger 17 during the above-mentioned normal heating operation is defrosted. can do.

Here, when the defrosting treatment is performed, the necessary and sufficient heat is received from the hot water storage tank 2 side as much as possible in order to suppress the deterioration of the heating feeling due to the decrease in the indoor temperature during the treatment as much as possible. It is preferable to defrost without excess or deficiency. For that purpose, it is important to set the hot water on the heating circulation circuit 4 side to the optimum temperature for giving an appropriate amount of heat.

According to the study by the inventors of the present application, the higher the temperature at which hot water is taken out from the hot water storage tank 2, the shorter the time required for the defrosting treatment, and the heating to the indoor side of the indoor heat exchanger 27 during the defrosting treatment. It was found that the ability is also increased. Correspondingly, in the present embodiment, the pipe 5b is connected to the lower part of the hot water storage tank 2 and the pipes 5d and 5c are connected to the intermediate portion in the vertical direction, and the mixing valve 10E is provided at the confluence point thereof.

On the other hand, the take-out control unit 420A (see FIG. 5) of the hot water storage control unit 420 determines the take-out temperature of the hot water from the hot water storage tank 2 according to the magnitude of the heating load on the refrigerant circulation circuit 30 side. Then, the mixing valve 10E is taken out so that the temperature of the hot water derived (that is, the incoming water temperature T1 detected by the incoming water temperature sensor 23) becomes the taken-out temperature according to the determined take-out temperature. The mixing ratio is controlled by the control unit 420A.

As a result, when the heating load is large and the heating capacity required for the indoor side is high, for example, the ratio of hot water from the pipes 5d and 5c is increased to make the take-out temperature relatively high, and the refrigerant circulation circuit 30 side receives a larger amount of heat. Can be obtained from the heating circulation circuit 4 side. On the contrary, when the heating load is small and the heating capacity required for the indoor side is low, for example, the ratio of hot water from the pipe 5b is increased to make the take-out temperature relatively low, so that the refrigerant circulation circuit 30 side is more than necessary. It is possible to prevent wasteful heat reception from the heating circulation circuit 4 side.

<Concrete method>
Specifically, in the present embodiment, the mixing ratio in the mixing valve 10E is set so that the take-out temperature is within the range of 15 ° C. or higher and 45 ° C. or lower according to the magnitude of the heating load during normal heating operation. Be controlled. FIG. 11 shows an example of the specific control content.

As shown in FIG. 11, in this example, when the heating load during the normal heating operation is large and the rotation speed of the compressor 14 is relatively high, the indoor heating capacity required for the defrosting process is large. The take-out temperature from the hot water storage tank 2 is determined by the take-out control unit 420A to be about 40 ° C. did). Further, when the heating load during the normal heating operation is rather large and the rotation speed of the compressor 14 is medium rotation, the indoor heating capacity required for the defrosting process is slightly large, so that the temperature at which the compressor 14 is taken out from the hot water storage tank 2 Is determined to be 30 ° C. by the take-out control unit 420A (however, according to the study by the inventors of the present application, it has been found that there is no problem if it is within the range of 25 ° C. to 35 ° C.). Further, when the heating load during the normal heating operation is small and the rotation speed of the compressor 14 is relatively low, the indoor heating capacity required for the defrosting process is small, so that the temperature at which the compressor 14 is taken out from the hot water storage tank 2 is small. Is determined to be 20 ° C. by the take-out control unit 420A (however, according to the study by the inventors of the present application, it has been found that there is no problem if it is within the range of 15 ° C. to 25 ° C.). In addition, it is not controlled by the three categories shown in this figure, and the taking-out temperature is set appropriately between each of these categories according to the magnitude of the heating load (high or low rotation speed of the compressor 14). It may be finely controlled (see FIG. 13 described later).

<Processing procedure>
Processing executed by the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, the heat exchange control unit 440, and the heat pump control unit 450 in order to realize the above method during the heating cycle defrosting assist operation. The procedure will be described with reference to the flowchart shown in FIG.

In FIG. 12, for example, when the outdoor unit control unit 410 detects (by a known method) that a large amount of frost is attached to the heat pump heat exchanger 17 during the normal heating operation, the heating cycle defrosting assist operation is performed. The start is instructed, and in step S10, it is determined whether or not the start of the heating cycle defrost assist operation is instructed. If the start is not instructed, this determination is not satisfied (S10: NO), and the loop waits until this determination is satisfied. If the start is instructed, this determination is satisfied (S10: YES), and the process proceeds to step S20.

In step S20, the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 cooperate with each other to start the heating cycle defrosting assist operation. That is, as described above with reference to FIG. 10, the defrosting assist operation for melting the frost generated in the outdoor heat exchanger 17 during the normal heating operation before that is started. After that, the process proceeds to step S30.

In step S30, the take-out control unit 420A of the hot water storage control unit 420 acquires the rotation speed (specifically, the rotation speed control value) of the compressor 14 representing the heating load.

After that, the process proceeds to step S40, and the take-out control unit 420A refers to the table of FIG. Determine the take-out temperature.

Then, the process proceeds to step S50, and the take-out control unit 420 controls the opening degree of the mixing valve 10E so as to reach the take-out temperature determined in step S40.

After that, for example, when the outdoor unit control unit 410 detects that the defrosting is completed (by a known method), it instructs the end of the heating cycle defrosting assist operation, and in step S60, the end of the heating cycle defrosting assist operation. Is determined whether or not is instructed. If the end is not instructed, this determination is not satisfied (S60: NO), and the loop waits until this determination is satisfied. If the end is instructed, this determination is satisfied (S60: YES), and the process proceeds to step S70.

In step S70, the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 cooperate with each other to stop the heating cycle defrosting assist operation started in step S20. It returns to the normal heating operation and ends this flow.

<Example of actual temperature behavior>
FIG. 13 shows an example of the time-dependent behavior of the actual indoor air temperature (room temperature) and the heating load, and the time-dependent behavior of the take-out temperature when the method of the present embodiment described above is executed.

In FIG. 13, when the normal heating operation starts up, the heating load is large due to the low room temperature and the indoor heating capacity required for the defrosting process is large. Therefore, as described above with reference to FIG. 11, the hot water storage tank 2 is taken out. The temperature will be 40 ° C. After that, as the operation is continued and the room temperature gradually rises as time elapses, the heating load gradually decreases and the heating load (in other words, the indoor heating capacity) also decreases, and as a result, the temperature taken out from the hot water storage tank 2 Also gradually decreases from 40 ° C. Then, when the room temperature has almost stopped rising (in other words, the heating load has stopped falling) and reaches about 20 ° C., the temperature at which the hot water is taken out from the hot water storage tank 2 also stops falling at 20 ° C. and stabilizes in this state. In this way, by gradually lowering the take-out temperature in accordance with the decrease in the heating load, it is possible to prevent the refrigerant circulation circuit 30 side from wastefully receiving heat from the heating circulation circuit 4 side.

<Effect of the first embodiment>
As described above, according to the heat pump water heater 1 of the present embodiment, the heat of the refrigerant gas is dissipated in the outdoor heat exchanger 17, which is generated in the outdoor heat exchanger 17 during the above-mentioned normal heating operation. It is possible to defrost the frost that has formed. As a result, it is possible to realize a defrosting process in which the heating operation is performed without stopping the heating operation while utilizing the heat of the hot water in the hot water storage tank 2 during the heating operation in winter. At this time, when the heating load is large, the take-out temperature is relatively high so that the refrigerant circulation circuit 30 side can obtain a larger heat, and when the heating load is small, the take-out temperature is relatively low. It is possible to prevent the refrigerant circulation circuit 30 side from unnecessarily receiving more heat than necessary. In this way, by receiving heat from the hot water storage tank 2 side according to the amount of heat radiated from the indoor heat exchanger 27 side, it is possible to perform reliable defrosting without stopping the heating operation. Further, by preferentially using medium-warm water whose boiling efficiency is lowered for defrosting, it is possible to improve the boiling efficiency when the boiling operation is executed in the heat pump unit 500.

Further, in the present embodiment, in particular, the mixing valve 10E mixes low-temperature water from the low-temperature water take-out pipe 5b and medium-temperature water from the medium-temperature water take-out pipes 5c and 5d at an appropriate mixing ratio based on the control of the take-out control unit 420A. Mix. As a result, hot water having an optimum temperature can be accurately generated and led out to the water-refrigerant heat exchanger 15.

Further, in the present embodiment, in particular, the take-out control unit 420A controls the mixing valve 10E so that the temperature of the hot water derived from the mixing valve 10E is within the range of 15 ° C. or higher and 45 ° C. or lower. This has the following significance. That is, usually, when hot water is boiled into the hot water storage tank 2 (for example, in the boiling operation performed by the heat pump unit 500), in order to make the boiling efficiency relatively high, the hot water at a relatively high temperature of about 60 ° C. or higher is usually used. Is generated. The high-temperature water is supplied from the upper part of the hot water storage tank 2 and is stored in the upper part of the hot water storage tank 2, and is used for bathing, showering, hand washing, etc. at the time of hot water discharge. On the other hand, due to the decrease in the high temperature water due to the hot water discharged during use by the user and the accompanying water supply from the lower part of the hot water storage tank 2, the middle part and the lower part in the hot water storage tank 2 are difficult to use for the above purposes at 30 ° C. to 45 ° C. Medium-temperature water at about ° C and low-temperature water at about 15 ° C to 30 ° C are stored. According to the present embodiment, the hot water in the hot water storage tank 2 is effective by generating hot water for the water refrigerant heat exchanger 15 by using the medium hot water or low temperature water in the temperature range of 15 ° C to 45 ° C. It can be utilized.

Further, in the present embodiment, in particular, apart from the heating cycle defrosting assist operation (see FIG. 10) in which the defrosting treatment is performed, the discharge side of the compressor 14 → the indoor heat exchanger 27 → the outdoor heat exchanger 17 → compression. A normal heating operation (see FIG. 9) can be performed by forming a refrigerating cycle of the suction side path of the machine 14 and using heat absorption from the atmosphere as a heat source.

Further, in the present embodiment, in particular, the take-out control unit 420A of the hot water storage control unit 420 sets the take-out temperature according to the rotation speed of the compressor 14, which is normally controlled to increase or decrease the rotation speed according to the magnitude of the heating load. decide. By using a clear index representing the heating load, it is possible to accurately receive heat from the hot water storage tank 2 side according to the magnitude of the heat radiation amount on the indoor heat exchanger 27 side.

In addition, as the control valve, instead of the mixing valve 10E, a switching valve that can be selectively switched may be provided on the pipe 5b side or the pipe 5c side. The take-out control unit 420A controls switching in the switching valve so that the temperature of the hot water derived from the switching valve becomes a temperature close to the taking-out temperature. For example, when the heating load is large and the heating capacity required for the indoor side is high, the hot water is taken out only from the pipes 5d and 5c to raise the take-out temperature relatively, and the refrigerant circulation circuit side receives a larger amount of heat on the hot water circulation circuit side. Can be obtained from. On the contrary, when the heating load is small and the heating capacity required for the indoor side is low, the take-out temperature can be relatively low by taking out hot water only from the pipe 5b, for example. In this way, either the low-temperature water from the pipe 5b or the medium-temperature water from the pipes 5c and 5d is selectively led out to the water-side flow path of the water-refrigerant heat exchanger 15 and used, so that it is simple. It is possible to generate hot water at a suitable temperature with various controls and lead it out to the water-refrigerant heat exchanger 15.

Further, a plurality of the pipes 5d for taking out medium-temperature water are provided so that the positions of the connection points to the hot water storage tank 2 are different from each other in the height direction, and a plurality of on-off valves capable of communicating and controlling the plurality of pipes 5d are provided. You may. In this case, the take-out control unit 420A appropriately opens and closes any one (or an appropriate number thereof) of the plurality of on-off valves, so that the temperature of the hot water drawn out becomes a temperature close to the take-out temperature. Control to be. Also in this case, hot water having a suitable temperature can be generated by simple control and led out to the water-refrigerant heat exchanger 15.

Further, in the above, the take-out control unit 420A determines the take-out temperature according to the rotation speed of the compressor 14 representing the heating load, but the taking-out temperature is not limited to this. That is, the take-out temperature may be determined according to the deviation between the room temperature Tr detected by the room temperature sensor 34, which represents the heating load itself, and the air conditioner set temperature Tcon. In this case, the same effect as described above is obtained.

<Second Embodiment>
Hereinafter, the second embodiment of the present invention will be described with reference to FIGS. 14 and 15. This embodiment corresponds to the consumption of hot water in the hot water storage tank 2 used in the heating cycle defrosting assist operation in the first embodiment, and the heating circulation circuit 4 side is a refrigerant in the water refrigerant heat exchanger 15. A heating boiling operation (details will be described later) is performed in which hot water that has been heated by receiving heat from the circulation circuit 30 side is supplied into the hot water storage tank 2. The same reference numerals are given to the same parts as those of the first embodiment and its modifications, and the description thereof will be omitted or simplified as appropriate.

The heating boiling operation will be described with reference to FIG. During the heating boiling operation (corresponding to the heating boiling mode) shown in FIG. 14, the four-way valve 31 is switched to the heating side by the four-way valve control unit 410A. Further, the two-way valve control unit 440C switches the two-way valve 121 to the closed state and the two-way valve 122 to the open state. Further, the expansion valve control unit 440B controls the expansion valve 111 in a fully open state and the expansion valve control unit 410C controls the expansion valve 113 in a closed state, and the expansion valve control unit 440B opens the expansion valve 610 as appropriate. It is controlled to the adjusted state.

As a result, the piping section 18a on the discharge side of the compressor 14 → the piping section 18b → the piping section 26a → the indoor heat exchanger 27 → the piping section 26b → the water refrigerant heat exchanger 15 → the bypass circuit 600 (expansion valve 610) → the piping section 18f → outdoor heat exchanger 17 → piping portion 18e (two-way valve 122) → piping portion 18d → a refrigerant path of the piping portion 18c on the suction side of the compressor 14 is formed.

As a result, the high-temperature and high-pressure refrigerant gas from the compressor 14 radiates heat to the indoor air in the indoor heat exchanger 27 (functions as a condenser) and condenses, and also condenses in the water refrigerant heat exchanger 15 (functions as a condenser). After radiating heat to the hot water from the hot water storage tank 2 to become a liquid refrigerant, the outdoor heat exchanger 17 (functioning as an evaporator) absorbs heat from the outside air to become a refrigerant gas to the compressor 14. return. That is, in this case, the water-refrigerant heat exchanger 15 as a condenser and the outdoor heat exchanger 17 as an evaporator are connected in series in this order.

At this time, the mixing valve 10E is fully opened on the pipe 5b side, and the hot water introduced from the hot water storage tank 2 via the pipe 5b is passed through the boiling pump 19 to the water side of the water refrigerant heat exchanger 15. It is led out to the flow path 15a. Further, the three-way valve 10C in the heating return pipe 6 is switched so as to conduct the pipe 6a side and the pipe 6c, and the three-way valve 10D is switched so as to conduct the pipe 6c and the pipe 6d. Then, the boiling pump 19 rotates under the control of the pump control unit 440A, so that the hot water taken out from the hot water storage tank 2 is condensed in the water-side flow path 15a of the water refrigerant heat exchanger 15 as described above. After heat is exchanged with the flow path 15b on the refrigerant side to absorb heat and heat is heated, the heat is returned to the intermediate portion of the hot water storage tank 2 via the pipe 6c and the pipe 6d (corresponding to the return pipe).

<Processing procedure>
A processing procedure executed by the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, the heat exchange control unit 440, and the heat pump control unit 450 in order to realize the method during the heating boiling operation. Will be described with reference to the flowchart shown in FIG.

In FIG. 15, first, in step S15, for example, the outdoor unit control unit 410 determines whether or not the start of the normal heating operation is instructed by an appropriate operation on the remote controller 60. If the start is not instructed, this determination is not satisfied (S15: NO), and the loop waits until this determination is satisfied. If the start is instructed, this determination is satisfied (S15: YES), and the process proceeds to step S25.

In step S25, the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 cooperate with each other to start the normal heating operation (see FIG. 9). After that, the process proceeds to step S35.

In step S35, for example, the outdoor unit control unit 410 acquires the rotation speed (specifically, the rotation speed control value) of the compressor 14 representing the heating load, as in step S30.

After that, in step S65, for example, the outdoor unit control unit 410 determines whether or not the end of the normal heating operation is instructed by an appropriate operation on the remote controller 60. If the end is instructed, this determination is satisfied (S65: YES), and the process proceeds to step S75.

In step S75, the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 cooperate with each other to stop the normal heating operation started in step S25, and this flow is performed. finish.

On the other hand, if the end is not instructed in the step S65, the determination is not satisfied (S65: NO), and the process proceeds to the newly provided step S80.

In step S80, for example, whether or not the outdoor unit control unit 410 stabilizes the rotation speed of the compressor 14 (for example, the above-mentioned rotation speed control value) for a predetermined period (a certain long term) (in other words, for a certain period of time). Whether or not the heating load is stable) is determined. If it is not stable, this determination is not satisfied (S80: NO), the process returns to step S35, and the same procedure is repeated. If it is stable, the determination is satisfied (S80: YES), and the process proceeds to step S90.

In step S90, it is determined whether or not the temperature condition for heating boiling is satisfied (in other words, whether or not the environment requires execution of defrosting operation). Specifically, the evaporative refrigerant temperature in the outdoor unit control unit 410 detects the outside air temperature Tire detected by the outdoor air temperature sensor 22 or the outdoor heat exchanger 17 detected by the refrigerant temperature sensor 35 defrosts. It is determined whether or not the temperature range is within a predetermined temperature range at which it is presumed that the operation to be performed needs to be performed. Alternatively, a predetermined temperature range in which it is presumed that the indoor unit temperature Tr at the start of operation detected by the indoor unit control unit 430 needs to perform defrosting operation. It is determined whether or not it was inside. If the temperature condition is not satisfied, this determination is not satisfied (S90: NO), the process returns to step S35, and the same procedure is repeated thereafter. If it is stable, this determination is satisfied (S90: YES), and the process proceeds to step S100.

In step S100, whether or not the amount of the medium hot water in the hot water storage tank 2 is equal to or more than a predetermined value, based on the detection result of the hot water storage temperature by the hot water storage temperature sensor 12. Is determined. If the amount of medium hot water is less than the predetermined value, this determination is not satisfied (S100: NO), the process returns to step S35, and the same procedure is repeated. If the amount of medium-temperature water is equal to or greater than a predetermined value, this determination is satisfied (S100: YES), and the process proceeds to step S105.

In step S105, as in step S75, the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 cooperate with each other to perform the normal heating operation started in step S25. Stop. After that, the process proceeds to step S110.

In step S110, the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 cooperate with each other to start the heating boiling operation. That is, as described above with reference to FIG. 14, the heating boiling is such that the heating circulation circuit 4 side receives heat from the refrigerant circulation circuit 30 side by the water refrigerant heat exchanger 15 and supplies the heated hot water into the hot water storage tank 2. Start the top operation. After that, the process proceeds to step S120.

In step S120, the hot water storage control unit 420 performs the heating boiling operation started in step S110 based on the detection result of the hot water storage temperature by the hot water storage temperature sensor 12, and the medium hot water in the hot water storage tank 2. It is determined again whether or not the amount is equal to or greater than the predetermined value. If the amount of the medium hot water is less than a predetermined value, this determination is not satisfied (S1200: NO), and the loop waits until this determination is satisfied. If the amount of the medium hot water is equal to or greater than a predetermined value, this determination is satisfied (S120: YES), and the process proceeds to step S130.

In step S130, the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 cooperate with each other to stop the heating boiling operation started in step S110. After that, the process returns to step S25 and the same procedure is repeated.

As described in the operation mode, in the present embodiment, the four-way valve 31, the two-way valves 122, 121, the expansion valves 113, 111, the expansion valve 610, and the bypass circuit 600 are used. The mixing valve 10E, the three-way valves 10C and 10D, and the outdoor unit control unit 410, the hot water storage control unit 420, the indoor unit control unit 430, and the heat exchange control unit 440 that control them are claimed. It functions as the mode switching means described in the section.

<Effect of the second embodiment>
As described above, according to the heat pump water heater 1 of the present embodiment, the following effects are obtained in addition to the same effects as those of the first embodiment.

That is, according to the present embodiment, the hot water in the hot water storage tank 2 is consumed by being used in the heating cycle defrosting assist operation in the first embodiment, and the heating circulation circuit 4 side is water by the above-mentioned method. Hot water that has been heated by receiving heat from the refrigerant circulation circuit 30 side in the refrigerant heat exchanger 15 can be supplied into the hot water storage tank 2. That is, for example, by utilizing the surplus capacity of the heating capacity generated by the lightening of the heating load due to the normal heating operation for a certain period of time and radiating heat to the hot water of the hot water storage tank 2, the medium for use in the subsequent defrosting treatment. Hot water can be generated, supplied to the hot water storage tank 2 and replenished. As a result, the heating operation is temporarily interrupted due to defrosting, as in the case where the medium-temperature water runs out without the defrosting of the outdoor heat exchanger 17 being completed and the defrosting is performed by the cooling cycle of the conventional method. Can be prevented.

It should be noted that there is a possibility that the outdoor heat exchanger 17 is likely to be frosted by executing the heating boiling operation. However, by using the medium hot water generated as described above in this heating boiling operation in the heating cycle defrost assist operation, the time required for the defrosting process is shortened (compared to the case where it is not performed). can do. As a result, it is possible to prevent a decrease in the feeling of heating due to an increase in room temperature when the defrosting treatment is executed.

Further, in the present embodiment, in particular, in step S90, it is determined whether or not the temperature condition for heating boiling is satisfied (in other words, whether or not the environment requires execution of defrosting operation). Thereby, it is determined whether or not the environment requires the execution of the defrosting treatment based on the outside air temperature Tire, the evaporated refrigerant temperature, and the room temperature Tr, and the heating is performed only when the defrosting treatment is necessary. It is possible to perform boiling processing by boiling operation. As a result, unnecessary boiling can be prevented and efficiency can be improved.

Further, in the present embodiment, in particular, in step S100, it is determined whether or not the amount of the medium hot water in the hot water storage tank 2 is equal to or more than a predetermined value. As a result, the heating boiling operation can be performed only when the amount of medium-temperature water used for the defrosting treatment is small, depending on the state of storage of hot water in the hot water storage tank 2. As a result, unnecessary boiling can be prevented and efficiency can be improved.

The present invention is not limited to the above aspects, and can be applied without changing the gist thereof. For example, at least one of the two-way valves 121 and 122 is an expansion valve having a closing function. You may replace it with. Further, instead of the expansion valves 111, 113, 610, an ejector may be used as a decompressor.

1 Heat pump water heater (hot water storage type water heater with air conditioning function)
2 Hot water storage tank 4 Heating circulation circuit (hot water circulation circuit)
5 Heating going pipe (hot water pipe)
5b piping (low temperature water take-out pipe)
5c, 5d piping (medium hot water take-out pipe)
6 Heating return pipe (hot water pipe)
6d piping (return pipe)
10E mixing valve (control valve)
14 Compressor 15 Water refrigerant heat exchanger 15a Refrigerant side flow path 15b Water side flow path 17 Outdoor heat exchanger (heat pump heat exchanger)
18 Refrigerant piping 22 Outside air temperature sensor 27 Indoor heat exchanger 30 Refrigerant circulation circuit 31 Four-way valve 34 Indoor temperature sensor 35 Refrigerant temperature sensor 67 Outdoor fan 77 Indoor fan 111 Expansion valve 113 Expansion valve 121 Two-way valve 122 Two-way valve 410 Outdoor unit Control unit 410A Four-way valve control unit 410C Expansion valve control unit 410E Two-way valve control unit 420A Take-out control unit (valve control means, take-out temperature determination means)
440 Heat Exchange Control Unit 440B Expansion Valve Control Unit 440C Two-way Valve Control Unit 600 Bypass Circuit 601 Expansion Valve Tcon Air Conditioner Set Temperature (Target Room Temperature)
Tr room temperature (actual room temperature of room temperature)

Claims (9)

A water-refrigerant heat exchanger that exchanges heat between the refrigerant and water,
An indoor heat exchanger that exchanges heat between the refrigerant and the indoor air,
A compressor connected to the water-refrigerant heat exchanger and the indoor heat exchanger,
A heat pump heat exchanger that is connected in parallel to the water refrigerant heat exchanger to the compressor and exchanges heat between the refrigerant and the outside air.
A hot water storage tank that stores hot water and
Have,
The water side of the water refrigerant heat exchanger and the hot water storage tank are connected in a ring shape by a hot water pipe to form a hot water circulation circuit.
The refrigerant side of the water-refrigerant heat exchanger, the compressor, the indoor heat exchanger, and the heat pump heat exchanger are connected by a refrigerant pipe to form a refrigerant circulation circuit.
The water refrigerant heat exchanger that communicates with the discharge side of the compressor to the inlet side of the indoor heat exchanger that functions as a condenser and functions as an evaporator or heat exchanger to the outlet side of the indoor heat exchanger. The inlet side is communicated, the inlet side of the heat pump heat exchanger functioning as a condenser or a radiator is communicated with the outlet side of the water refrigerant heat exchanger, and the compressor is communicated with the outlet side of the heat pump heat exchanger. In a hot water storage type water supply machine with a heating / cooling function, which communicates with the suction side of the heat exchanger and defrosts the heat pump heat exchanger by using the heat received by the refrigerant in the water refrigerant heat exchanger.
The hot water circulation circuit is
A low-temperature water take-out pipe connected to the lower part of the hot water storage tank and taking out hot water in the hot water storage tank,
A medium-temperature water take-out pipe connected to the vertical middle portion of the hot water storage tank and taking out hot water in the hot water storage tank,
Hot water provided at the confluence of the low-temperature water take-out pipe and the medium-temperature water take-out pipe and introduced from the hot water storage tank via the low-temperature water take-out pipe and hot water introduced from the hot water storage tank via the medium-temperature water take-out pipe. A control valve that leads at least one of them to the water side of the water refrigerant heat exchanger,
Equipped with
and,
A take-out temperature determining means for determining the take-out temperature of the hot water from the hot water storage tank at the time of executing the defrosting treatment according to the heating load on the refrigerant circulation circuit side.
A valve control means for controlling the control valve according to the take-out temperature determined by the take-out temperature determining means,
A hot water storage type water heater with an air-conditioning function, which is characterized by the provision of. The control valve is
It is a mixing valve capable of mixing hot water introduced from the hot water storage tank via the low temperature water take-out pipe and hot water introduced from the hot water storage tank via the medium hot water take-out pipe in a desired ratio.
The valve control means
The hot water storage type water heater with an air-conditioning function according to claim 1, wherein the mixing ratio in the mixing valve is controlled so that the temperature of the hot water derived from the control valve becomes the take-out temperature. The control valve is
A switching valve that can be selectively switched to the low temperature water take-out pipe side or the medium-temperature water take-out pipe side.
The valve control means
The hot water storage type water heater with an air-conditioning function according to claim 1, wherein the switching in the switching valve is controlled so that the temperature of the hot water derived from the control valve becomes a temperature close to the take-out temperature. The valve control means
The invention according to any one of claims 1 to 3, wherein the control valve is controlled so that the temperature of the hot water derived from the control valve is within the range of 15 ° C. or higher and 45 ° C. or lower. Hot water storage type water heater with heating and cooling function described. The inlet side of the indoor heat exchanger is communicated with the discharge side of the compressor, and the inlet side of the water refrigerant heat exchanger is communicated with the outlet side of the indoor heat exchanger. The defrosting heating mode in which the defrosting treatment is performed by communicating the inlet side of the heat pump heat exchanger with the outlet side and the suction side of the compressor with the outlet side of the heat pump heat exchanger, and the above. The inlet side of the indoor heat exchanger functioning as a condenser is communicated with the discharge side of the compressor, and the inlet side of the heat pump heat exchanger functioning as an evaporator is communicated with the outlet side of the indoor heat exchanger. 1. Any of claims 1 to 4, further comprising a mode switching means capable of switching between a normal heating mode in which the suction side of the compressor is communicated to the outlet side of the heat pump heat exchanger. The hot water storage type water heater with heating and cooling function described in item 1. The take-out temperature determining means is
5. The take-out temperature is determined according to the rotation speed of the compressor, which represents the heating load, or the deviation between the actual room temperature of the room air and the preset target room temperature. Hot water storage type water heater with heating and cooling function described. The hot water circulation circuit is
It is connected to the vertical middle part of the hot water storage tank and is equipped with a return pipe that returns hot water to the hot water storage tank.
The mode switching means is
The defrosting heating mode, the normal heating mode, and the inlet side of the indoor heat exchanger functioning as a condenser are communicated with the discharge side of the compressor, and the condenser is connected to the outlet side of the indoor heat exchanger. The inlet side of the water refrigerant heat exchanger functioning as an evaporator is communicated with the outlet side of the water refrigerant heat exchanger, and the inlet side of the heat pump heat exchanger functioning as an evaporator is communicated with the outlet side of the water refrigerant heat exchanger. A heating boiling mode in which the suction side of the compressor is communicated with the outlet side and hot water heated by the heat received from the refrigerant in the water refrigerant heat exchanger is supplied to the hot water storage tank. The hot water storage type water supply machine with a heating / cooling function according to claim 5 or 6, wherein the hot water storage type water supply machine is configured to be switchable. The mode switching means is
The claim is characterized in that it is determined whether or not the heating boiling mode needs to be executed based on the outside air temperature, the evaporating refrigerant temperature of the heat pump heat exchanger functioning as an evaporator, or the actual room temperature of the indoor air. Hot water storage type water heater with heating and cooling function described in 7. The mode switching means further
The hot water storage type water heater with a heating / cooling function according to claim 8, wherein the normal heating mode is switched to the heating boiling mode according to the storage state of hot water in the hot water storage tank.

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